单项选择题

Your facsimile prognostic chart indicates that you will cross the cold front of a low pressure system in about 24 hours.You should（）.

A.Expect to see cirrus clouds followed by altostratus and nimbostratus clouds
B.Alter course to remain in the navigable semicircle
C.Prepare for gusty winds，thunderstorms，and a sudden wind shift
D.Expect clear weather，with steady winds and pressure，until the front passes

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单项选择题

You have determined that you are in the right semicircle of a tropical cyclone in the Northern Hemisphere.What action should you take to avoid the storm（）.

A.Place the wind on the starboard quarter and hold that course
B.Place the wind on the port quarter and hold that course
C.Place the wind on the port bow and hold that course
D.Place the wind on the starboard bow and hold that course

单项选择题

Which type of precipitation is a product of the violent convection found in thunderstorms（）.

A.Snow
B.Freezing Rain
C.Hail
D.Sleet